Tuesday, April 14, 2015 11:30am EST
From Hall A Wiki
Last meeting: Thursday, March 26, 2015 10:00am EST
Collimator working group meeting
Agenda
- Engineering
- KK Intro. slides
- Jason's summary
- Supports
- Water cooling
- Remote adjustments
- Physics
- power deposited sims
- sensitivity sims
Minutes
Attending: Juliette, Jason, Ernie, Tyler, Seamus, KK, Jim
- Account extended at MIT, waiting for funds from JLAB
- KK's intro
- Slide 4 - downstream of target beampipe needs to be designed
- definitely metal seals throughout
- top could maybe be rubber
- Slide 5 - Collimator concept
- collimator 3 catches lowest angle
- power divided between 1 and 3
- 5 does not exist, but other numbers are accurate
- last green is new 5
- Slide 6 - estimated power still old numbers
- new numbers are pretty close
- beampipe shown as designed in slide 14
- Slide 7 - E158 Concept (won't work exactly)
- micrometer controls to change orientation of collimator (x, y)
- we have to support along radial direction in shadow of collimators
- 1 and 3 have to be precisely placed
- 1, 2 and 3, 4 could be single units but collimator 3 has slipped further upstream
- 2, 4 need to be placed to within 1mm for the acceptance definition
- 1, 3 have to be more stringent b/c of the difference in the power deposited (0.5 mm)
- design for more power than estimated and also precision placement
- Slides 8-14 2-bounce system
- Need to block line of sight to detectors
- slide 4 - encircle beampipe close to target
- beam pipe to shield photons from edge of 1 and 2
- 13 - shows how to block line of sight
- 14 - realistic geometry
- 15-18 - zoomed "beampipe shields" in hybrid and upstream regions
- 15 bottom 3 mm of W works
- 16, 17 - "beampipe shield" in upstream
- 18 - "beampipe shield" in hybrid
- high Z but non-magnetic (iron free) exact permeability? (Rembar)
- Slide 4 - downstream of target beampipe needs to be designed
- Moving forward
- Questions:
- How to support all and align (1, 3 in particular)
- Materials (W, Cu) cooling vs. shielding vs. weight
- water cooling leads that don't interfere with envelope
- 2, 4 need 40 radiation lengths along z (20, 25 absolute minimum)
- inner and outer radii for 1, 3 fixed by CAD (length along z, Moliere radius)
- Engineers will provide some feedback
- Physicists will run by CAD and check physics
- Questions:
- Next meeting will be Thursday, April 23rd at 2pm ET
Return to Teleconferences
Return to MOLLER at 11 GeV E09-005